name: Check Links in README

on:
  workflow_dispatch:

jobs:
  check-links:
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Check all links in markdown files
        run: |
          #!/bin/bash
          set -o pipefail
          
          echo ""
          echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
          echo "🔍 Checking ALL Links in All Markdown Files"
          echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
          echo ""
          
          # Find all markdown files
          find . -name "*.md" -type f | sort > all_markdown_files.txt
          total_files=$(wc -l < all_markdown_files.txt)
          echo "📊 Found $total_files markdown files to check"
          echo ""
          
          has_errors=0
          
          # Process each markdown file
          while IFS= read -r md_file; do
            echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
            echo "📄 Checking: $md_file"
            echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
            
            file_has_errors=0
            
            # Extract ALL links from the markdown file
            {
              # Markdown links []()
              grep -oP '\]\(([^\)]+)\)' "$md_file" 2>/dev/null | sed 's/](\(.*\))/\1/' || true
              # Image links ![]()
              grep -oP '!\[[^\]]*\]\(([^\)]+)\)' "$md_file" 2>/dev/null | sed 's/!\[.*\](\(.*\))/\1/' || true
              # Video src attributes
              grep -oP '<video[^>]+src="([^"]+)"' "$md_file" 2>/dev/null | sed 's/.*src="\([^"]*\)".*/\1/' || true
            } > /tmp/links_$$.txt
            
            link_count=$(wc -l < /tmp/links_$$.txt 2>/dev/null || echo "0")
            
            if [ $link_count -eq 0 ]; then
              echo "  ℹ️  No links found in this file"
              echo ""
              continue
            fi
            
            echo "  📊 Found $link_count links to check"
            echo ""
            
            # Categorize and check links
            > /tmp/download_$$.txt
            > /tmp/media_$$.txt
            > /tmp/video_$$.txt
            > /tmp/tags_$$.txt
            
            # Check each link
            while IFS= read -r link; do
              [ -z "$link" ] && continue
              
              # Decode URL-encoded characters
              decoded_link=$(echo "$link" | sed 's/%20/ /g' | sed 's/%23/#/g' | sed 's/%28/(/g' | sed 's/%29/)/g' | sed 's/%E2%80%A2/•/g' | sed 's/%E1%9A%96/ᚖ/g' | sed 's/%E3%80%8A/《/g' | sed 's/%E3%80%8B/》/g' | sed 's/%E3%80%8E/『/g' | sed 's/%E3%80%8F/』/g' | sed 's/%E2%9B%94/⛔/g' | sed 's/%E2%9C%A8/✨/g' | sed 's/%7B/{/g' | sed 's/%7D/}/g' | sed 's/%2B/+/g' | sed 's/%E3%83%86/テ/g' | sed 's/%E3%83%B3/ン/g' | sed 's/%E3%83%8D/ネ/g' | sed 's/%E3%82%B9/ス/g' | sed 's/%E3%82%A4/イ/g' | sed 's/%E3%83%BB/・/g' | sed 's/%E3%83%95/フ/g' | sed 's/%E3%83%AA/リ/g' | sed 's/%E3%83%BC/ー/g' | sed 's/%E3%83%8A/ナ/g' | sed 's/%5B/[/g' | sed 's/%5D/]/g')
              
              # Determine link category and validation status
              status="✅"
              
              # Check if it's an external URL
              if [[ "$decoded_link" =~ ^https?:// ]]; then
                # Check external URL with curl
                http_code=$(curl -s -o /dev/null -w "%{http_code}" --max-time 10 \
                  -H "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36" \
                  "$link" 2>/dev/null || echo "000")
                
                # Accept 2xx and 3xx status codes as valid
                if ! [[ "$http_code" =~ ^[23][0-9][0-9]$ ]]; then
                  status="❌ (HTTP $http_code)"
                  file_has_errors=1
                  has_errors=1
                fi
                
                # Categorize external URLs
                if [[ "$decoded_link" =~ /export/.*\.(osk|osz)$ ]]; then
                  echo "  $status $decoded_link" >> /tmp/download_$$.txt
                elif [[ "$decoded_link" =~ /media/gameplay/.*\.(mp4|webm)$ ]]; then
                  echo "  $status $decoded_link" >> /tmp/video_$$.txt
                elif [[ "$decoded_link" =~ /src/tag/ ]]; then
                  echo "  $status $decoded_link" >> /tmp/tags_$$.txt
                elif [[ "$decoded_link" =~ /media/(panel|icons|thumbnail)/ ]]; then
                  echo "  $status $decoded_link" >> /tmp/media_$$.txt
                else
                  echo "  $status $decoded_link" >> /tmp/download_$$.txt
                fi
              else
                # Local file - remove leading slash if present
                if [[ "$decoded_link" =~ ^/ ]]; then
                  file_path="${decoded_link#/}"
                else
                  md_dir=$(dirname "$md_file")
                  file_path="$md_dir/$decoded_link"
                fi
                
                # Check if file exists
                if ! [ -f "$file_path" ]; then
                  status="❌ (not found)"
                  file_has_errors=1
                  has_errors=1
                fi
                
                # Categorize local files
                if [[ "$decoded_link" =~ \.(webp|png|jpg|jpeg)$ ]]; then
                  echo "  $status $decoded_link" >> /tmp/media_$$.txt
                elif [[ "$decoded_link" =~ \.md$ ]]; then
                  echo "  $status $decoded_link" >> /tmp/tags_$$.txt
                else
                  echo "  $status $decoded_link" >> /tmp/download_$$.txt
                fi
              fi
            done < /tmp/links_$$.txt
            
            # Display categorized results
            if [ -s /tmp/download_$$.txt ]; then
              echo "download:"
              cat /tmp/download_$$.txt
              echo ""
            fi
            
            if [ -s /tmp/media_$$.txt ]; then
              echo "media:"
              cat /tmp/media_$$.txt
              echo ""
            fi
            
            if [ -s /tmp/video_$$.txt ]; then
              echo "video:"
              cat /tmp/video_$$.txt
              echo ""
            fi
            
            if [ -s /tmp/tags_$$.txt ]; then
              echo "tags:"
              cat /tmp/tags_$$.txt
              echo ""
            fi
            
            rm -f /tmp/download_$$.txt /tmp/media_$$.txt /tmp/video_$$.txt /tmp/tags_$$.txt
            
            rm -f /tmp/links_$$.txt
            
            if [ $file_has_errors -eq 0 ]; then
              echo ""
              echo "  ✅ All links valid in this file"
            else
              echo ""
              echo "  ❌ Some links are broken in this file"
            fi
            echo ""
            
          done < all_markdown_files.txt
          
          echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
          
          if [ $has_errors -eq 0 ]; then
            echo "✅ FINAL RESULT: All links are valid across all markdown files!"
            echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
            exit 0
          else
            echo "❌ FINAL RESULT: Some links are broken. Please review the output above."
            echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
            exit 1
          fi